Question

A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 ms⁻¹. The magnitude of its momentum is recorded as

1. 17.6 kg ms^-1
2. 17.565 kg ms^-1
3. 17.56 kg ms^-1
4. 17.57 kg ms^-1

Answer 1

 

Momentum, p = m \(\times\) v

= 3.513\(\times\)5.00 = 17.565 kg m/s

= 17.6 kg m/s

Here number of significant digits in m is 4 and in v is 3, so, p must have minimum (which is 3) significant digit.